Update appveyor to use build images

Author: baylesj

.travis.yml

@@ -33,7 +33,7 @@ matrix:
          LIB_TYPE=static
          BUILD_TYPE=release
       script: ./.travis_scripts/meson_builder.sh
-    - name: xenial clang meson static release testing
+    - name: Linux xenial clang meson static release testing
       os: linux
       dist: xenial
       compiler: clang
@@ -48,7 +48,7 @@ matrix:
       install:
            - source ./.travis_scripts/travis.install.${TRAVIS_OS_NAME}.sh
       script: ./.travis_scripts/meson_builder.sh
-    - name: xenial gcc cmake coverage
+    - name: Linux xenial gcc cmake coverage
       os: linux
       dist: xenial
       compiler: gcc

appveyor.yml

@@ -2,10 +2,14 @@ clone_folder: c:\projects\jsoncpp
 
 environment:
   matrix:
-    - CMAKE_GENERATOR: Visual Studio 14 2015
-    - CMAKE_GENERATOR: Visual Studio 14 2015 Win64
-    - CMAKE_GENERATOR: Visual Studio 15 2017
-    - CMAKE_GENERATOR: Visual Studio 15 2017 Win64
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      CMAKE_GENERATOR: Visual Studio 14 2015
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      CMAKE_GENERATOR: Visual Studio 14 2015 Win64
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      CMAKE_GENERATOR: Visual Studio 15 2017
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      CMAKE_GENERATOR: Visual Studio 15 2017 Win64
 
 build_script:
   - cmake --version